docs: def create(gandi, name, datacenter, subnet, gateway, background):
      """ Create a new vlan """
      try:
          gandi.datacenter.is_opened(datacenter, 'iaas')
      except DatacenterLimited as exc:
          gandi.echo('/!\ Datacenter %s will be closed on %s, '
                     'please consider using another datacenter.' %
                     (datacenter, exc.date))
  
      result = gandi.vlan.create(name, datacenter, subnet, gateway, background)
  
      if background:
          gandi.pretty_echo(result)
  
      return result